Calculate the direction of 
and the midpoint of line segment P1P2. P1(5, -2, 7) and P2(9, -5, 2)
A. 
i + 
j + 
k; 
B. 
i + 
j + 
k; 
C. 
i - 
j - 
k; 
D. 
i - 
j - 
k; 
Answer: A
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A. 
B. 
C. 
D. 
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< 2
A. 
B. 
? 
C. 
D. 
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